Rugged Marine-Grade Alternator Built for Powerful Battery Charging

The ARCO Zeus A225S is a high-output alternator designed for marine, RV, commercial, and military systems requiring fast, efficient charging of large battery banks. Delivering up to 254 amps, it significantly reduces engine runtime while supporting system-wide voltage stability. 1" single foot with spacer and isolated ground configuration. With advanced cooling features, corrosion-resistant finishes, and multiple mounting options, it’s ideal for high-demand electrical environments.

Key Features

  • High output performance: Provides up to 254 amps at 9,000 RPM for rapid battery charging, even at low engine speeds.
  • Advanced thermal management: Dual cooling fans, external rectifier, and heat-shedding coatings reduce operating temperatures by 8–20%.
  • Durable exterior finish: E-Coat and Cerakote finishes offer excellent protection against heat and corrosion in marine environments.
  • Flexible mounting options: 1" single foot with spacer and isolated ground configuration.
  • Regulation versatility: Supports both internal and external voltage regulation for system-specific flexibility.
  • Marine safety certified: Meets SAE J1171 ignition protection standards for safe marine operation.

Built for demanding electrical loads, this alternator ensures performance, safety, and long-term reliability.

Electrical Specifications
Voltage 12V
Field Type P
Rotor Poles 16
Stator Size 130mm
Regulation Internal/External (IE) or External Only (EX)
Output Voltage 14.1V (default)
Cut-In RPM 1,061 Alternator RPM
Maximum Alt RPM 19,000
Max Output (Cold, 9,000 RPM) 254 Amps
Sustained Cruising Output (Hot, 6,000 RPM) 187 Amps
Sustained Idle Output (Hot, 3,000 RPM) 157 Amps
Diodes 6 positive, 6 negative, 50A Rated, Avalanche
Mechanical & Mounting
Frame Size Small
Weight 12 lbs / 6.7 kg
Finish (Black) Cerakote or E-coating
Battery Post M8 Thread Post, Side Mount
Standard Pulley 49K6 (6-groove, 49mm)
Pulley Mount 17mm diameter shaft, 25mm long, threaded M17 x 1.5
Pulley Hardware M17 x 1.5 x 24mm nut, with 18mm ID x 29mm OD washer (Included)
SKU ARC.4015
Model # 4015
Brand Arco Marine
Shipping Weight 7.0000kg
Shipping Width 0.390m
Shipping Height 0.260m
Shipping Length 0.260m
Shipping Cubic 0.026364000m3
Unit Of Measure ea

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